@smlx4
Well there are three things (at least in Germany)
1. proprietary right of the architect, so you must not change anything if the architect refuses
2. Standards (DIN, ISO, EN) and legal regulation. if one does no comply it is considered as dangerous and personal savety is higher than other right.
3. If you deploy a star architect for your house there is no symphathy form my side for such problems
@red_rooster @smlx4 out of curiosity (also living in germany):
about 1., I have heard a similar argumentation regarding our office design, but lets say I hire an architect for my personal home, why would I be required to use that as is, no matter the copyright? Wouldnt I hire them for a design that is then in my property to use as I see fit, even change?